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Inersia : Jurnal Teknik Sipil dan Arsitektur

inersia
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Published by Universitas Negeri Yogyakarta

ISSN : 0216762X EISSN : 2528388X DOI : -

Core Subject : Engineering,

Civil Engineering, Building, Construction & Architecture

INERSIA is stand for INformasi dan Ekspose hasil Riset Teknik SIpil dan Arsitektur. This scientific journal is managed by the Department of Civil Engineering and Planning Education, Faculty of Engineering, Yogyakarta State University, in cooperation with the Persatuan Insinyur Indonesia (PII). It publishes and disseminates research results from lecturers and post graduate students from various universities in Indonesia, which has contributed to the development of science and technology, especially in the field of Civil Engineering and Architecture. INERSIA is published twice a year, in May and December.

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Articles 312 Documents

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DIFRAKSI GELOMBANG PADA SILINDER 8ESAR DENGAN MILD SLOPE EQUATION Didik Purwantoro
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 2, No 2 (2006): September
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThis research is aimed to know the process of wave diffractionaround the large cylinder of offshore structure using finite elementmethod. This model chosen because of some reasons, i.e thecomplication of offshore structure's shape which are caused difficultiesto conduct physical model solving. The other excess of this numericalmodel is cheaper and easier than physical model conducted in thelaboratorium.The equation of wave diffraction can be formulated as Helmholtzequation. A second approach can be developed by Mild Slope Equation,which is assumed that the depth is constant. The Helmholtz equationwas done using finite element method with linear triangle interpolation.With finite element method, the complicated domain area can be solvedmore easily and effectively.The result shows that the use of finite element method is stilladequate to solve Helmholtz equation' for period 8, 9 and 10 second.For period of 8 second numerical error produce the wave heightdifference of 0,36 m. The numerical model is then easily edited toanalyze another offshore structures.Keywords: diffraction, cyllinder, finite element

PENGGUNAAN SUMUR RESAPAN UNTUK MENGURANGI GENANGAN AIR HUJAN DI KAMPUS KARANGMALANG UNIVERSITAS NEGERI YOGYAKARTA Lutjito, Sudiyono AD, Didik Purwantoro
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 11, No 1 (2015): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThe objectives of this studywas to solve the problem of floodwater due to the rainwater runoffand to reduce the flow rate of the runoff at the Colombo Street in front of the Faculty of SportScience, Yogyakarta State University (YSU). This study was conducted based on the existingprimary and secondary data. The data analysis to get the rainfall intensity was conducted usingthe analytical method that obtain the values of the standard deviation, the mean, the coefficientof variation, the asymmetry and kurtosis. From these values, it was obtained the types ofeligible distribution after going through the test to get the maximum rainfall in the period of 2years, 5 years, 10 years, 20 years and 25 years. Based on the data, the arch intensity wasexamined. The analysis showed if20% of YSU area is occupied by infiltration wells or if thereare 250 infiltration wells in which 1 infiltration well is used for the area of 350 m2, the need ofinfiltration wells will be covered and it is going to reduce the flow rate of the runoff in 0.552 m3/s.This is consistent with the concept of sustainable rainwater drainage system based on theconservation of ground Water. Essentially,it is a drainage system in which the rainwater fallingon the roof/pavement, is accommodated in a system of water absorption among othersinfiltration Wells therefore it will reduce the the floodwater runoff at the Colombo street. Anotherbenefit isthe infiltration wells will also increase the ground water level.Keywords: Rate of Flow, Infiltration Well, Rain Water

KONTROL DEBIT BANJIR BENDUNG DI KALI KUNING Sutikno Lutjito
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 10, No 2 (2014): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThis study aims to determine design–flood discharge that occur in existing dam at Kali Kuning riverand calculate flood discharge at 4 control points Chek Dam Kuning, Yapah, Ngadirojo andDadapan Weir. The background of this study is flood disaster at Kalikuning river.The study iscarriedout by hydrology and hydraulic analysis. The analysis of hydrology which included: testing ofconsistency data of rain fall, analysis of area averaged rain fall, design rain fall and testing ofgoodness of fit by using Smirnov-Kolmogorof test and chi square test. The analysis of hydrauliciscarried out by calculation the height ofthe design flood at each control pointusing Bundchuformulation. The study results show that for 5th rain fall recorder, namely Kaliurang, Pakem,Sorasan, Sopalan and Tanjungtirto using the Rational Method, Weduwen, and Hasperare obtainedthe flood discharge for 100 year return period as follows (1) Chek dam Kuning 129.253 m3/sec, (2)Yapah weir 226.697 m3/sec (3) Ngadirojo weir 262.062 m3/sec, (4) Dadapan weir 287.046 m3/sec.By using Bundchu formulation are obtained the overflow depth as follows: (1) 1.254 m, (2) 2,526m, (3) 2,163 m, (4) 3.157 m. The result explained that in Ngadirojo weir and Dadapan weirnotableto accommodate High Run off design flood of Kali Kuning river, while in the others control pointsare relatively safe.Keywords: Flood discharge, high runoff, Kali Kuning river,

APLIKASI KONSEP KONSERVASI PADA KAWASAN BANTARAN SUNGAI STUDI KASUS: CLARKE QUAY Ari Widyati Purwantiasning
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 6, No 2 (2010): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACTAs a result of excursion studies’ series in Singapore in October 2009, severalstudies on the region in Singapore had been summarized successfully, including theassessment of conservation areas.Singapore River as one of river bank conservationarea, known as Clarke Quay, has been touched on during this excurcion studies.. Thispaper will examine how the concept of conservation had been applied to to this areaconsidering to promote a Clarke Quay tourist centre area. It also will study more abouthow the relationship of physical elements of the city with the concept of conservationnowadays.Keywords: conservation, Clarke Quay

KAJIAN NILAI-NILAI KEARIFAN LOKAL PADA ARSITEKTUR HOTEL BINTANG DAN HUNIAN VERTIKAL DI KAWASAN CAGAR BUDAYA YOGYAKARTA Muhammad Arief Kurniawan; Chyntyaningtyas Meytasari
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 15, No 1 (2019): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRACTYogyakarta City Government (Pemkot) and the surrounding Regency Government (Pemkab) get a lot of criticism from the public regarding policies that have resulted in massive vertical residential development in the form of hotels and apartments. In addition, the presence of vertical housing is also feared to have an impact on changes in community culture.This study aims to examine the extent to which local wisdom values are applied to star hotels and vertical occupancy in the Yogyakarta Cultural Heritage Area and what direction can be obtained so that star hotels and vertical housing are able to incorporate the value of local wisdom in YogyakartaThis research was conducted using the transforming tradition method. The main principles of the ATUMICS method are about regulation, combination, integration, or a mixture of basic elements of tradition with modernity.The results of the analysis found that the percentage of local wisdom in star hotels and vertical buildings in malioboro 8%, Kraton 15%, Puro Pakualaman 10%, Kotagede 30% and Kotabaru 5%. The average of all is 13.6%. This proves that the value of local wisdom in star hotels and vertical buildings is still low (below 50%). Most star hotels and vertical buildings have not adopted the type of architecture that suits their respective regions. The total stars and vertical buildings still display modern architecture and the present as the main architecture.Keywords: cultural heritage areas, star hotels, value of local wisdom, vertical residential

PENGARUH PENGGUNAAN KOLOM PASIR, LAYER PASIR, DAN TERUCUK BAMBU PADA TANAH LEMPUNG JENUH AIR TERHADAP PENURUNAN TANAH LEMPUNG MENGGUNAKAN UJI LABORATORIUM Wibowo, Dian Eksana; S., Satriarda Dirgantara; Kurniawan, Ridwan
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol 16, No 1 (2020): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRAKPenelitian ini bertujuan untuk mengetahui klasifikasi jenis tanah, properti tanah pengujian dan pengaruh penggunaan metode penambahan variasi tanah lempung jenuh air dengan menggunakan pasir dan cerucuk bambu, terhadap penurunan tanah lempung, kadar air, dan analisis T90. Penelitian eksperimen dengan menggunakan model boks baja, berukuran 100 cm x 100 cm x 40 cm sebagai media penempatan tanah lempung. Hasil penelitian ini yaitu: (1) Jenis tanah termasuk CH (Clay High Plasticity) menurut klasifikasi USCS dan kelompok 4-7-6(40) menurut klasifikasi AASTHO. (2) Properti tanah adalah G=2,63, LL=74,71%, PL=29,76%, IP=44,95%, SL=19,06%, C=0,75 kg/cm2, OMC=39,2%. (3) Penambahan TPV sangat efektif memperkecil penurunan. Pada pemberian tekanan 0,0125 kg/cm2, 0,025 kg/cm2, 0,05 kg/cm2, dan 0,01 kg/cm2 memperkecil penurunan, berturut-turut: 75,93%; 56,32%; 59,44% dan 42,32%. Pada kedalaman -10 cm penggunaan TPH paling efektif mengurangi kadar air tanah lempung yaitu sebesar 53,30%, berarti mengurangi kadar air sebesar 3,62% dari kondisi tanah asli (TTD). Pada kedalaman 20 cm, penggunaan TCB paling efektif mengurangi kadar air sebesar 3,55% dari kadar air tanah lempung asli (TTD). Penggunaan CTPVH pada beban 0,1 kg/cm2 paling efektif dalam proses konsolidasi yaitu sebesar 94,10% dari tanah asli (TTD) dimana mempunyai nilai sebesar nilai t90 untuk CTPVH yaitu sebesar 15,21 menit. Kata Kunci: air, perkuatan, tanah lempung, T90 ABSTRACT This study aims to determine the classification of soil types, soil properties tested and the effect of using the method of adding variations in the water-saturated clay, using sand and bamboo piles, to clay settlement, moisture content, and T90 analysis. The experimental study used a steel box model, measuring 100 cm x 100 cm x 40 cm as a medium for clay placement. The results of this study are: (1) Soil types including CH (Clay High Plasticity) according to USCS classification and groups 4-7-6 (40) according to AASTHO classification. (2) Soil properties is G=2,63, LL=74,71%, PL=29,76%, IP=44,95%, SL=19,06%, C=0,75 kg/cm2, OMC=39,2%. (3) Addition of TPV is very effective in reducing the settlement. At a pressure of 0,0125 kg/cm2, 0,025 kg/cm2, 0,05 kg/cm2, and 0.01 kg/cm2 minimizing the settlement, respectively: 75,93%; 56,32%; 59,44% and 42,32%. At depths of -10 cm the most effective use of TPH reduces clay soil moisture content by 53,30%, which means reducing water content by 3,62% from the original soil conditions (TTD). At a depth of 20 cm, using TCB is most effective at reducing water content by 3,55% from the original clay soil content (TTD). The use of CTPVH at a load of 0,1 kg/cm2 is most effective in the consolidation process which is 94.10% of the original soil (TTD) which has a value of T90 for CTPVH which is 15,21 minutes. Keywors: water, strainthening, clay, T90

PENGARUH DESAIN COURTYARD TERHADAP KONSUMSI ENERGI UNTUK AC (AIR CONDITIONER) DAN PENCAHAYAAN (Studi Simulasi Hipotetik Bangunan Tinggi Perkantoran di Jakarta) Galih Gusti Yudha Saelendra; Jatmiko Adi Suryabrata; Dimas Wihardyanto
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 14, No 1 (2018): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRACT Increasing the natural lighting can reduce the lighting energy consumption haw a weather but it can be potentially increasing the weather energy so there must be strategy needed to save the energy. That condition is the problem statement of this research, to know the configuration of the natural lighting and the effective cooling load. In this research, the simulation method with hypothetic building object has been used to test how big the influence of courtyard dimension, (Wall To Window Ratio) WWR and glass type towards the total consumption of energy for AC (Air Conditioner) and lighting. The result of this research is the most affective courtyard configuration is courtyard dimension 1, WWR 30 %, stopsol glass type. From the courtyard dimension variable, WWR and glass type, for the total energy consumption for AC and the highest lighting influenced its energy efficiency is clear glass type 15,56%, panashap glass 9,09%, WWR 70% 6,25%, WWR 50% 1,91%, courtyard dimension 2 0,27%, courtyard dimension 3 0,18%. In Jakarta with the tropical climate is not suitable to apply the courtyard application which is too big, it must be concerned the wide and high proposition so the total energy consumption for AC and lighting would not be so big. While the open orientation is not so influencing the sun radiation, so avoid the open part from east and west. For the WWR building range is between 50% - 70% must be paid attention in choosing the glass type because as small as the SC (Shading Coefficient) is lower the sun radiation. Keywords : AC (Air Conditioner), Courtyard, Glass type, Lighting, WWR. ABSTRAK Meningkatkan pencahayaan alami dapat mengurangi konsumsi energi pencahayaan namun, berpotensi meningkatkan energi penghawaan maka diperlukan strategi untuk penghematan energi. Kondisi tersebut yang menjadi permasalahan dalam kajian ini, untuk mengetahui konfigurasi pencahayaan alami dan beban pendinginan yang efektif. Dalam kajian ini digunakan metode simulasi dengan objek bangunan hipotetik untuk menguji besar pengaruh dimensi courtyard, (Wall To Window Ratio) WWR dan Jenis kaca terhadap total konsumsi energi untuk AC (air conditioner) dan pencahayaan. Hasil dari kajian ini adalah konfigurasi courtyard yang paling efektif yaitu dimensi courtyard 1, WWR 30%, jenis kaca stopsol. Dari variabel dimensi courtyard, WWR dan jenis kaca, untuk total konsumsi energi untuk AC dan pencahayaan yang paling tinggi berpengaruh dalam efesiensi energinya adalah jenis kaca clear 15.56%, kaca panashap 9.09%, WWR 70% 6,25%, WWR 50% 1,91%, dimensi courtyard 2 0.27%, dimensi courtyard 3 0.18%. Pada kota Jakarta dengan kondisi iklim tropis kurang cocok untuk pengaplikasian courtyard yang terlalu besar, harus di perhatikan proporsi lebar dan tinggi courtyard agar total konsumsi energi untuk AC dan pencahayaan tidak terlalu besar. Sedangkan orientasi bukaan sangat berpengaruh terhadap radiasi matahari, sehingga hindari bukaan dari arah timur dan barat. Untuk range WWR bangunan antara 50 -70% perlu di perhatikan dalam memilih jenis kaca karena semakin kecil SC (Shading Coefficient) maka semakin rendah radiasi matahari. Kata kunci: AC (Air Conditioner), Courtyard, Jenis kaca, Pencahayaan, WWR.

UJI EKSPERIMENTAL GESER INTERFACE SUBSTRATE DAN TOPPING DENGAN VARIASI KEKUATAN TEKAN PADA LAPIS TOPPING Indah Nurrahman
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 14, No 2 (2018): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThe study aims to: determine the shear strength of concrete connection with applying compressive strength variations plans on topping layer. Extra toppings on a substrate made 28 days (the concrete substrate) and shear test connection 56 days of age (age 28 days connection). The type of concrete used is normal concrete where the connection does not roughened surface and without addictive substances. The study was conducted using laboratory experiments. This study uses the compressive strength of concrete plans substrate 20 MPa (NCS20) and compressive strength of concrete plans topping is 20 MPa (NCT20), 25 MPa (NCT25) and 30 MPa (NCT30). The test object cuboid with dimensions of 20x20x20cm. In the concrete susbtrate has a thickness of 12.5 cm and for concrete topping with a thickness of 7.5 cm. Each specimen consists of 3 specimens with a total of 9 specimens. Data analysis using quantitative descriptive. The results of the study obtained compressive strength in the sample substrate with a mean NCCS20 notation is 18.51 MPa. Concrete topping cylindrical samples with notation NCCT20, NCCT25, and NCCT30 obtained a mean compressive strength is 22.21 MPa, 24.39 MPa and 30.93 MPa. Shear strength test results NCST20-20 connection with the notation, NCST20-25, and NCST20-30 ie 0.44 MPa, 0.45 MPa and 0.3 MPa. Value shear test connection is influenced by several factors, such as the connection surface texture, hydration process, aggregate functions, compressive strength, porosity of concrete, slump value and watertight.Keywords: shear strength of the connection, substrate, toppingABSTRAKKajian dilakukan untuk mengetahui kuat geser sambungan beton dengan menerapkan variasi kekuatan tekan rencana pada lapis topping. Penambahan topping pada substrate dilakukan umur 28 hari (umur beton substrate) dan uji geser sambungan umur 56 hari (umur sambungan 28 hari). Jenis beton yang digunakan adalah beton normal dimana permukaan sambungannya tidak dikasarkan dan tanpa bahan zat adiktif. Kajian dilakukan dengan metode eksperimen di laboratorium. Kajian ini menggunakan kuat tekan rencana beton substrate 20 MPa (NCS20) dan kuat tekan rencana beton topping yaitu 20 MPa (NCT20), 25 MPa (NCT25), dan 30 MPa (NCT30). Benda uji berbentuk kubus dengan dimensi 20x20x20cm. Pada bagian beton susbtrate memiliki ketebalan 12,5 cm dan untuk beton topping dengan ketebalan 7,5 cm. Setiap spesimen berjumlah 3 buah benda uji dengan jumlah keseluruhan 9 buah benda uji. Analisis data menggunakan deskritif kuantitatif. Hasil dari kajian didapat kuat tekan pada sampel substrate dengan notasi NCCS20 rerata yaitu 18,51 MPa. Beton silinder sampel topping dengan notasi NCCT20, NCCT25, dan NCCT30 didapat kuat tekan rerata yaitu 22,21 MPa, 24,39 MPa dan 30,93 MPa. Hasil uji kuat geser sambungan dengan notasi NCST20-20, NCST20-25, dan NCST20-30 yaitu 0,44 MPa, 0,45 MPa dan 0,3 MPa. Nilai uji geser sambungan dipengaruhi oleh beberapa faktor, seperti tekstur permukaan sambungan, proses hidrasi, fungsi agregat, kuat tekan, porositas beton, nilai slump dan kedap air Kata kunci: kuat geser sambungan, substrate, topping

ANALISIS NILAI KAPASITAS STRUKTUR ATAS JEMBATAN DENGAN MENGGUNAKAN METODE RATING FACTOR Saputra, Andika Arief; Priyosulistyo, Hrc.; Muslikh, Muslikh
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol 16, No 1 (2020): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRAKJembatan merupakan infrastruktur transportasi yang vital. Jika suatu jembatan mengalami kegagalan maka lumpuhlah sistem tersebut. Oleh karena itu, kajian ini bertujuan untuk mengetahui nilai kapasitas sisa jembatan eksisting sehingga dapat dinilai bahwa jembatan tersebut masih layak digunakan atau tidak. Kajian ini dilakukan pada segmen P1-P5 (arah Dawuan) jembatan Cinapel yang terletak di Kabupaten Sumedang. Jembatan ini merupakan jembatan beton prategang. Metode kajian yang digunakan adalah metode load rating factor. Dilakukan dengan menghitung kapasitas dukung gelagar dan plat lantai kendaraan. Standar perhitungan dengan mengacu pada Peraturan Penentuan Bridge Load Rating untuk Jembatan Eksisting dari Menteri Pekerjaan Umum dan Perumahan Rakyat (03/SE/M/2016). Dari hasil perhitungan didapatkan hasil bahwa nilai RF gelagar bentang tepi, bentang tengah, dan plat lantai kendaraan memiliki nilai >1 yang artinya bahwa struktur jembatan Cinapel bentang P1-P5 arah Dawuan aman dalam melayani lalu lintas yang melintasi jembatan.Kata kunci: jembatan beton prategang, load rating factor, struktur atasABSTRACTBridges are vital transportation infrastructure. If a bridge fails then the system is chaos. Therefore, this study aims to determine the remaining capacity of the existing bridge where the bridge is still suitable for use or not. This research was conducted on the P1-P5 segment (Dawuan direction) Cinapel bridge located in Sumedang Regency. This bridge is a prestressed concrete bridge. The research method used is the load rating factor method. It was carried out by calculating the carrying capacity of the girder and slab of the bridge. Calculation refer to the Determination for Existing Bridges using Load Rating Factor of the Minister of Public Works and Public Housing (03/SE/M/2016). The results of calculation obtained that the RF of the outer span girder, middle span, and slab are greater than 1 (RF > 1) which means that the structure of the Cinapel bridge span P1-P5 is safe.Keywords: prestressed concrete bridge, load rating factor, upper structure

PEMANFAATAN LIMBAH KARBIT DAN PASIR SEBAGAI USAHA PERBAIKAN TANAH LEMPUNG MENGGUNAKAN UJI CBR DAN KONSOLIDASI DENGAN PEMADATAN LABORATORIUM Dian Eksana Wibowo; Endaryanta Endaryanta
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 13, No 2 (2017): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACT Many cases of buildings such as highways, parking areas, buildings, damaged / cracked and undulating and excessive sets resulting from clay soil behavior on the ground. The ugly nature of this soil technique can actually be reduced for example by soil stabilization. Chemical stabilization can be by mixing clays with cement, lime, or waste carbide and sand. The experimental method research was conducted on clay from Prambanan by mixing waste of carbide and sand. Mixing is done through 3 modes: direct mix, sand-lime columns, and layer. These objects are then tested for CBR and Consolidation test. The result of this research is CBR value, and Cc Cr value. The results showed that: Based on CBR-test the results obtained: a) CBR-soaked value will rise up to 93.8% (from the original 2.12% to 4.11%) with Layer 3cm mode. b). The CBR-soaked value can rise 45.7% (from the original 2.12% to 3.09%) with the 1.5-inch column mode. c) The CBR-unsoaked value will fall slightly to 1.7% (from the original 11.26% to 11.07%) in the layer mode. d) The CBR-unsoaked value could rise 3.2% (from the original 11.26% to 11.62%) in column mode. Based on the Consolidation test obtained: a) The Cc Compression Index value of the soil will decrease if the clay is mixed with sand + carbide waste. The more the mixture of sand + carbide waste (up to 15%) then the value of Cc will decrease further. The percentage decrease in the value of Cc is 108.7% (from the original 0.215 to 0.103). b) Recompression Coefficient Value / Cr ground development will decrease if clay is mixed with sand + carbide waste. The more the mixture (up to 15%) then the value of Cr will decrease further. Cr value percentage of Cr is very big, that is 233.% (from the original 0.010 to 0.003). This result indicate that this methods will improve the clay soil, namely : a) increase the strength of soil, b) decrease (drastic) the compressibility / expandsivity of clay soil. Keywords : CBR, waste-carbide, clay, consolidation. ABSTRAK Banyak kasus bangunan semisal : jalan raya, areal parker, gedung, yang rusak/retak-retak dan bergelombang dan setlemen berlebih yang diakibatkan oleh perilaku/sifat tanah lempung di tanah dasar. Sifat teknik tanah yang jelek ini sebenarnya bisa direduksi misalnya dengan stabilisasi tanah. Stabilisasi kimiawi bisa dengan cara mencampur lempung dengan bahan semen, kapur, atau limbah karbit dan pasir. Penelitian metode eksperimen ini dilakukan pada lempung dari Prambanan dengan cara dicampur limbah karbit dan pasir. Pencampuran ditempuh melalui 3 mode yaitu : mix langsung, kolom pasir-kapur, dan layer. Benda-benda- uji ini lalu diuji CBR dan uji Konsolidasi. Hasil penelitian ini berupa nilai CBR, dan nilai Cc Cr. Hasil penelitian menunjukkan bahwa :Berdasarkan uji-CBR diperoleh hasil : a) Nilai CBR-soaked akan naik sampai 93,8% ( dari asli 2,12% menjadi 4,11%) dengan mode Layer 3cm. b). Nilai CBR-soaked bisa naik 45,7% (dari asli 2,12% menjadi 3,09%)dengan mode kolom 1,5 inci. c) Nilai CBR-unsoaked akan turun sedikit sampai 1,7% (dari asli 11,26% menjadi 11,07%) pada mode layer. d) Nilai CBR-unsoaked bisa naik 3,2% ( dari asli 11,26% menjadi 11,62%) pada mode kolom. Berdasarkan uji Konsolidasi diperoleh : a) Nilai Indek Compressi Cc tanah akan menurun jika lempung dicampur pasir + limbah karbit. Makin banyak campuran pasir + limbah karbit (sampai 15%) maka nilai Cc akan makin menurun. Prosentase penurunan nilai Cc adalah sebesar 108,7% ( dari aslinya 0,215 menjadi 0,103 ). b) Nilai Koefisien Rekompressi / pengembangan tanah Cr akan menurun jika lempung dicampur pasir + limbah karbit. Makin banyak campurannya (sampai 15%) maka nilai Cr akan makin menurun. Prosentase penurunan nilai Cr adalah amat besar, yaitu sebesar 233,3 % ( dari aslinya 0,010 menjadi 0,003 ).Hasil ini menunjukkan bahwa cara ini akan memperbaiki tanah lempung, yaitu : a) menaikkan (sedikit) kuat dukung tanah tidak terendam , b) amat menurunkan ekspansivitas tanah lempung. Kata kunci: CBR, limbah-karbit, lempung, konsolidasi.

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